Photographic-printing machine.



J. H. FULLMER & R. W. RUNSER.

PHOTOGRAPHIC PRINTING MACHINE.

APPLICATION FILED JUNE 16. 1914.

Patented May 8, 1917.

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5 4 MUM J. H. FULLMER & R. W. RUNSER.

PHOTOGRAPHIC PRINTING MACHINE.

APPLICATlON FlLED JUNE 16. 1914.

1,225,729. Patented May 8,1917.

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J. FULLMER & R. W. RUNSER. PHOTOGRAPHIC PRINTING MACHINE.

APPLICATION FILED JUNE 16, 1914- 1,225,729. Patented May 8, 1917.

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J. H. FULLMER & R. W. RUNSER.

PHOTOGRAPHIC PRINTING MACHINE,

Patented May 8, 1917.

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UNITED STATES PATENT OFFICE.

JOHN H. FULLMER AND ROBERT w. RUNSEI OF BUrrAn Ew YORK, AssIeNons T0HUnBNnaB EIsrE P TENTS cOMPANY, or BUFFALO, NEW yonn, A QORIORA- TION orEW Y rno'roenArnio-rniNriNe MACHINE.

- Specification of Letters IPatent.

Patented May 8, 1917.

Application filed. June 16, 1914. Serial No. 345,347.

T 0 all rv/ 20m it may, concern:

Be it known that we, JOHN H. FULLMEP. and ROBERT W. RUNSER, citizens ofthe United States, residing at Buffalo, in the county of Erie and Stateof New York, have invented new and useful Improvements in Photographic-Printing Machines, of which the following is a specification.

This invention relates tov a photographic printing machine which isadapted to produce photographic impressions or prints upon sensitizedsurfaces which are subse quently finished for use in producing printedmatter of different colors..-

ln machines of this character as heretofore constructed the organizationof the parts was such that the'm'eans for supporting the printing plate,the sensitized surfaces and the pressing devices had to he made undulyheavy in order to reduce the liability of the weight of the parts fromdistorting the machine and interfering with the registration of theprinting platerelative to the sensitized surface which would result inimperfect work. The'parts of the prior machines were also so arrangedthat the insertion of. the print: ing plate support into the machine andthe removal of the same therefrom was inconvenient and laborious andrequired much time in 'etting the machine ready for work. Furthermore,the sensitized surface was so mounted in the machine that dust, dirt orother foreign matter was liable to gather on the sensitized surface andresult in the production of imperfect printing plates.

It is the object of this invention to produce a n achine of thischaracter of comparatively simple construction and of low cost in whichthe printing plate supporting devices, the sensitized surface supportand the pressing devices are so mounted tlia't'the' weight of theseparts is not liable to disturb the register of the printing plate andthe sensitized surface relatively. to each other, also to permit theseparts to be readily manipulated without undue exertion or labor-o'n thepart of the operator and'also to prevent any" partly in section. Fig. 8is a fragmentary vertical. transverse section, on an enlarged scale,showing the means for supporting the printing plate and sensitizedsurface and associated parts.

fragmentary side elevation, on an enlarged scale of the means forpositionlng the printmg plate and sensitized surface horizontally onerelatively to the other. Fig. 6 is a fragmentary vertical longitudinalsection, on an enlarged -scale,.taken 1n lme 66, Fig. 5. T

Fig. 7 1s a fragmentary ho'izontal section taken in line 77, Fig. 3,showing the means the same. This member may be of any suitable characterand material, that shown in the drawings, for example having the formof. a plate or sheet which may be constructed of aluminum, zinc or othermetal. This scnsitized sheet orplate is preferably so mounted in themachine that the main part of t is same is arranged horizontally orsubstantially so and has the sensitized surface on the underside thereofso that this surface faces downwardly. Due to this arrangement of thesensitized plate any dust, dirt or other objectionable matter from anyother source can only lodge on the upper or back side of the sensitizedplate or sheetwliere the same can do no harm but is prevented fromlodging on the underside of this plate bearing the sensitized coating,ther eby preventing spoiling of the same and insuring the production ofperfect printingfrom thjisplate.

2 represents the transparent printing plate which may be constructed ofany suitable material either as a positive or as a negative and fromwhich photographic prints or impressions may be produced on thesensitized underside of the print receiving Fig. l is a horizontal sec-'tl-OIl takenv in line li, Flg. 1. Fig. 5 is a member by placing thistransparent printing plate in engagement with the underside of the printreceiving member and causing light rays to pass upwardly to the printingplate and act upon the sensitized surface.

8 represents a contact block or supporting platen which is adapted to bepressed against the upper back side or unsensitized surface of theprint-receiving member 013-- posite the place where the sensitized surface of the same is enga ed by the printing plate during the operationof producing an impression. The underside of the platen is preferablyprovided with a facing or cushion 4: of felt or similar yieldingmaterial which permits the pressure of the platen to be distributeduniformly over the back of the sensitized plate.

The means whereby this sensitized plate, the printing plate and thesupporting block or platen are supported and moved relatively to eachother in accordance with our invention comprise means whereby theprinting plate may be moved vertically to ward and from the sensitizedunderside of the print receiving plate, means for moving the impressionblock vertically toward and from the upper side of the print receivingplate, and means for moving the print re ceiving plate both in alengthwise and a transverse direction horizontally between the printingplate and supporting block for the purpose of permitting an impressionof the printing plate to be produced on various parts of the sensitizedsurface of the print receiving plate. The means for thus supporting theprint receiving plate are constructed as follows:

5, '6 represent two stationary horizontal guide rails or tracks arrangedparallel and lengthwise of the machine and supported at a suitabledistance from the ground or floor by means of upright posts or columns7, as shown in Figs. 1 and 2 or in any other suitable way. Upon thesetracks is mounted a horizontally and longitudinally slid able primarycarriage which preferably comprises two longitudinal slides 8, 9engaging with the upper sides of the front and rear longitudinalguideways or tracks, and two horizontal transverse bars 10, 10 arrangedparallel and connecting the corresponding ends of the front and rearslides 8, 9. The longitudinal movement of this yn'iinary carriage may beeffected by various means those shown in the drawings being suitable andcomprising two longitudinal gear racks 11, 11 secured to the opposinginner sides of the longitudinal tracks or rails, a transverse horizontalshaft 12 journaled in suitable bearings at one end of the primarycarriage, preferably the left hand end thereof, and provided at itsopposite ends with gear wheels 13, 13 meshing respectively with the gearracks ll, 11, a

hand crank ll journaled on a bracket 15 secured to lhe left hand end ofthe primary carriage, and a train of gear wheels for transmitting themovement of this crank to the transverse shaft 12 and comprising adriving gear wheel 16 turning with the hand crank 14, and anintermediate gear wheel 17 pivoted on the bracket 15 and meshing withthe driving gear wheel 16 and the ad jacent gear wheel 13 of thetransverse shaft.

Upon. the primary carriage is mounted a horizontally and transvei lyslidable secondary carriage which pronv ably comprises two horizontaltransverse bars 18, 18 and two longitudinal bars 19, 19 which connectthe corresponding ends of the transverse bars, and two slides 20, 20secured to the urulersides of the transverse bars 18 and engaging withtransverse tracks 21, 21 on the upper sides of the transverse bars 10,10 so that the secondary carriage is capable of moving horizontally andtransversely on the primary carriage and is also incapable of movinglengthwise with the latter, whereby the print receiving member mountedon u the secondary carriage is capable of moving in two directions atright angles to each other. Each of the bars of the secondary carriageis preferably constructed of an angle iron having a lower horizontalflange and an upper vertical flange projecting upwardly from the cute"edge of the horizontal flange, as shown in Figs. 1, 6 and 10. Thesecondary carriage may also be operated by various means, those shown inthe drawings being suitable and comprising a horizontal gear rack 2isecured transversely to the left hand track of the primary carriage, agear wheel pivotally mounted on the secondary carriage andinteri'neshing with the teeth of the gear rack 2i and a hand crank 26connected with the gear wheel Upon turning the crank l-fl, in onedirection or the other the primary carriage together with the secondarycarriage are moved to gether in a direction lengthwise of the machinevvhile upon turning the crank 26 in one direction or the other thesecondary carriage may be moved forwardly or backwardly horizontally ina direction transversely of the machine.

l Vithin the transversely movable carriage is mounted a rack whichcarries the sensitized plate or member. In its preferred form this rackcomprises a frame having two transverse parallel bars 27 and twolongitudinal bars 28 which connect corresponding ends of the transversebars. Each of the bars of this rack frame is preferably ofchannel-shaped form in cross section with its concave side facinginwardly and the transverse bars of this frame rest with their lowerflanges against the lower transverse flanges of the secondary carriageWhile the webs of these bars engage the inner sides of the vertical websof the transverse bars of the secondary carriage. This rack frame may beheld in a definite centered position in the secondary carriage by anysuitable means but preferably by means of clamping screws 29 arranged inthe vertical webs of the transverse bars 18 of the secondary carriageand engaging with the transversebars 27 of the rack f 'ame, as shown inFigs. 2 and 6. represents two stretching or supporting bars arrangedtransversely within the rack frame adjacent to opposite ends thereof andeach provided at its opposite ends with upper and lower lugs 31 forminga fork which embraces the upper and lower flanges of the adjacentchannel-shaped longitudinal rack frame bar. Each of these stretchingbars may be adjusted bodily on the rack frame in a direction lengthwiseof the machine by means of adjusting pins 32 extending verticallythrough openings in the forks and through one or another pair ofopenings 33 formed in longitudinal rows in the upper and lower flangesof the longitudinal bars 28 of the rack frame, as shown in Figs. 1 and2. The sensitized impression receiving plate is detachably secured atits opposite transverse edges to the stretching bars by means whichpermit of drawing this plate perfectly taut and holding the same in aneven and horizontal position while photo graphic impressions areproduced on the sensitized surface thereof and the same is shifted forpresenting different portions of its sensitized surface to the printingposition. Although various means may be employed for connecting the.sensitized plate with the stretching bars those shown in the drawingsare suitable and comprise a plurality of clamps each of which has aclamp ing arm 3% pivoted at its upper end on the adjacent stretching barso as to be capable of swinging in a vertical plane and pro vided with arelatively fixed gripping jaw 35 which is adapted to engage with oneside of the adjacent edge portion of the print receiving plate, arelatively movable gripping j aw 36 engaging with the opposite side ofthe print receiving plate and connected by means of a screw 37 with thecompanion fixed jaw, and a tightening screw 38 arranged in the arm 84and engaging with the adjacent vertical web of the companion stretchingbar, as shown in Fig. 10. By shifting the stretching bars toward or fromeach other within the frame of the rack and securing the same in theiradjusted position by means of the pins 82 it is possible to adapt therack to print receiving plates varying in length. i

In order to permit of definitely register ing the print receiving platerelatively to the printing plate and the impression block suitable stopdevices and indicators may be employed those shown in the drawings, for

example, consisting of a stop block 39 arranged on one of the transversebars of the secondary carriage and adapted to engage with a micrometerscrew i0 mounted on the primary carriage, and a stop block il arrangedon the primary carriage and adapted to engage with a micrometer screw 42on the stationary part of the machine. it coarse adjustment of thesecondary carriage relatively to the primary carriage may be effected byproviding a bracket which carries the micrometer screw lO and which isadapted to be secured at different points in the length of thetransverse gear rack 2- by means of pins 1 1 passing through openings inthe bracket 4:3 and different pairs of openings 45 formed in alongitudinal row in the transverse gear rack, as shown in Figs. 5 and 6.The openings 4L5 are spaced regularly and preferably suitably numberedso that they can be readily selected to secure the bracket 13 in thedesired place on the transverse gear rack for obtaining the coarseadjustment of the relation of the secondary carriage after which theexact adjustment of these parts may be effected by turning themicrometer screw 40 to the desired position and then shifting the secondary carriage so that its stop 89 engages this screw. The micrometerscrew 42 may be similarly secured to a longitudinal bar 16 on the mainframe for roughly positioning this micrometer screw relatively to theprimary carriage after which the last mentioned micrometer screw may beadjusted so that upon shifting the primary carriage until its stop 41engages with this screw these parts will be in their proper relativeposition for bringing the desired part of the print receiving plate tothe printing point. As shown in Figs. 2 and 10 the micrometer screw asis mounted on a bracket 17 which may be adjusted lengthwise on the bar46 by passing pins 18 through the bracket l? and different pairs ofopenings -29 formed in a longitudinal row in the bar 46.

Themeans for supporting and operating the transparent printing plate areconstructed as follows 50 represents a comparatively thick and strongtransparent supporting plate which is arranged horizontally and supportsthe printing plate on its upper side. This transparent supporting plateis preferably con structed of glass and rests upon the upper side of ahorizontal printing frame 51 preferably constructed of metal. Thisprinti frame is provided. with a central openin 52 which is covered bythe transparent supporting plate and which is of substantially the samesize or dimensions as the transparent printing plate so that the designon the printing plate may be transferred or impressed upon thesensitized underside of the print receiving plate by means of the lightof a lamp 53 arranged below the opening of the supporting plate. Thetransparent supporting plate is held against horizontal displacement onthe supporting frame by means of a plurality of cleats 5 secured to theupper side of the printing frame and engaging with the corners of thetransparent supporting plate and a plurality of retaining blocks securedto the upperside of the printing frame in position to engage with thecentral parts of the four edges of the supporting plate which ispreferably square, as shown in Figs. 1, 3, S and 10. The transparentprinting plate is held in place on the upper side of the transparentsupporting plate by means of a plurality of clamping devices each ofwhich has a aw 56 guided in a way 57 formed in the upper part of one ofthe retaining blocks and has its inner part projecting over the top ofthe transparent supporting plate and engaging with the adjacent edge ofthe printing plate, as shown in Fig. 3. Each of the clamping jaws may bemoved radially inward and outward by any suitable means those shown inthe drawings being suitable and comprising a clamping screw 58 journaledon the outer end of the companion jaw so as to be capable of turningtherein but incapable of axial movement relatively thereto and engagingits inner screw threaded portion with a threaded opening in the adjacentretaining block while its outer end is provided with a linger piece orbutton 60 for turning the same. Upon turning the clamping screw in onedirection or the other the clamping jaw is moved inwardly or outwardlyfor securing the transparent supporting and printing plates in positionfor releasing the same.

In the operative position of the transparent supporting and printingplates and the frame which carries the same are arranged in the upperend of a light chamber or lamp box 61 which is open at the top and provided in its lower part with an illuminating device of any suitablecharacter but preferably an electric lamp 53, as shown in Figs. 1 and10. This light chamber is provided with means which permit of readilyinserting the printing frame and associated parts into the light chamberpreparatory to performing the printing operation and also removing thisframe from the front side of the machine, which means are alsopreferably so constructed that they may be utilized for moving theprinting plate and associated parts toward and from the sensitizedunderside of the print receiving plate. In order to thus permit theprinting frame to be introduced into the upper part of the light chamberfrom the front side thereof the upper edge of the front wall 62 of thischamber is cut down so as to form a passageway, as shown at 63 in Fig.1, while the remaining three walls 64: of this chamber which is ofrectangular form, extend upwardly above the front wall and to a pointwhich is preferably on a line with the upper side of the printing frameand thereby serve to confine the printing frame against further forwardmovement in the light cham ber as well as against lateral movementtherein. The raising and lowering of the printing frame and the partsmounted thereon is preferably effected by a plurality of verticallyrotating eccentrics or cams 65 engaging the underside of the printingframe and mounted in two sets on two longitudinal shafts 66 which arejournaled horizontally in suitable bearings on the upper part of thelight chamber. Upon turning these cam shafts so that the low portions ofthe cams are uppermost, the printing frame and the parts mounted thereonare in their lowered position and the printing plate is out of contactwith the underside of the sensitized print receiving plate but 'uponturning the cam shafts so that the high parts of the cams are uppermostthe printing frame will be raised so that the printing plate is pressedfirmly into contact with the sensitized surface of the print receivingplate. While raising and lowering the printing frame a light tight jointis maintained between the same and the lamp box by engagement of therear and side edges of the printing frame with the adjacent rear andside walls of the lamp box and by a depending shutter flange 107 10garranged on the front edge of the printing frame and engaging with theouter side of the front wall of the lamp box, as shown in Figs. 1, 3 and8. The turning of the cam shafts may be effected by any suitable means 15 so that they operate in unison, the means for this purpose shown inthe drawings beingsuitable and comprising two rock arms 67 secured tocorresponding ends of the cam shafts and having their opposing innerends 1 provided with longitudinal slots 68 and overlapping each other, aclamping screw 69 passing through the slots 68 and bearing with its headat the outer end thereof against the outer side of one of the rock 115arms, and a screw nut 70 mounted on the threaded inner end of theclamping screw and adapted to slide vertically in an undercut guideway71 arranged on the adjacent wall of the light chamber. Upon loosening120 the clamping screw 69 and moving the same together with its nutdownwardly in the guideway 71 the rock arms 67 will be low ered, asshown by dotted lines in Fig. 3, and the cams will be turned so that the25 printing plate will be lowered out of engagement from the printreceiving plate. Upon raising the clamping screw 69 in the guideway 71until the rock arms 67 are in a horizontal position, as shown by fulllines 130 FUN in Fig. 2, the cams will be turned so as to press theprinting plate against the sensitised surface of the print receivingplate. Upon tightening the screw 69 the parts will be held in theiradjusted position.

The transparent supporting and printing plates are usually mounted onthe printing frame while these parts are removed from the printingmachine inasmuch as this can be done at this time more conveniently andexpeditiously. It is also desirable in order to get the best results toprovide different printing frames for different sizes of printingplates, each printing frame having an opening corresponding to the sizeor dimensions of the printing plate which is used for producingimpressions on the sensitized surface. In order therefore to permit theop erators to conveniently insert the assembled printing frame andtransparent supporting and printing plates into the lamp box as well asremoving the same therefrom the distance from the ground or floor to thetop of the lamp box is substantially equal to the breast height of aman. This will enable two men to easily handle the printing frame andthe parts associated therewith while in troducing or removing the samefrom the machine without unduly straining the operatives or liability ofdisplacing the parts notwithstanding that this printing frame andassociated parts are very heavy.

in order to permit of producing impressions of the printing plate at anangle on the sensitized surface for the purpose of economizing space andmaterial for certain classes of work, the lamp box or light cha1rher isso mounted that it is capable of rotating horizontally about a verticalaxis together with the parts mounted thereon. The preferred means foraccomplishing this purpose consists in mounting the bottom of the lightchamber on a table 72 which rests upon a supporting shelf 73 forming theupper part of a fixed base 74 wh ch rests upon the floor or ground, andprovlding the table with a depending cylindrical arbor or pivot 75 whichis journaledin a vertical bearing 76 formed in the adjacent part of thebe se and its shelf. The axis of the pivot 75 is vertically in line withthe opening in the printing frame and the printing plate, w iereby uponturning the light chamber horizontally the printing plate will bepresented at an, angle to the sensitized surface of the print receivingplate. After the light chamber and associated parts have been ad justcdhorizontally about the axis of this chamber to the desired positionthese parts are held against displacement by clamping means whichpreferably consist in provich ing the base with clamping lugs 77 onopposite sides of a vertical radial slot or split 79 formed in this baseand extending from the bore ofits bearing to-the periphery of the base,a right and left hand clamping screw 78 engaging its opposite ends withcorrespondingly threaded screw nuts 80 mounted on the clamping lugs, anda handle 81 connected with the central part of the clamping screw, asshown in Figs. 1 and 41. Upon turning the clamping screw 7 8 in onedirection the split portions of the base are loosened to release thepivot 75 and permit the light chamber and the parts mounted thereon tobe turned horizontally into the desired position after which the turningof the clamping screw in the opposite direction will cause the splitparts of the base to grip the pivot 75 and hold these parts in theadjusted position.

Means are provided for raising and lowering the back supporting block orplaten.

3, also for turning the same horizontally to suit the position of theprinting plate and associated parts and also to permit of removing thisbloclr from the machine so that it may be exchanged for one of larger orsmaller dimensions to suit the size of the printing plate of whichimpressions are be-- ing produced on the sensitized surface. Thepreferred means shown in the drawings for thus operating the supportingblock are constructed as follows:

82 represents a supporting arm projecting upwardly and forwardly fromthe rear part of the base so as to overhang the supporting block,primary and secondary carriages the light chamber and associated parts.In its front end the supporting arm is provided with a vertical guideway83 which is axially inline with the bearing in the base and in which anupright shank 84: is adapted to slide vertically. The vertical move mentof this shank in this guideway may be effected by various means those,for examp e, shown in the drawings being suitable and comprising ahorizontal shaft 85 journaled on. the supporting arm in rear of heguideway 83 and provided at its opposite ends with two gear wheels 86which mesh with two gear racks 87 arranged verticall on the adjacentrear part of the guide shanlr 8t, and a horizontal operating shaft 88journaled transversely in suitable hearings on the arm 82 and providedat its front or inner end with a worm 89 which meshes with a worm wheel90 on the central part of the shaft 85 while its outer or rear end isprovided with a handle 91 for turn ing the'operating shaft, as shown inFigs. 1 and 2. By this means the sliding shank may be raised and loweredbut the same is held against turning by engagement of the gear rackswith shoulders 92 formed on the supporting aim adjacent to oppositesides of the gear racks.

Arranged axially with the guide ali is a rertical pivot i ieh is capabturning horizontally in. a

and which is provided at its lower end with a supporting head 95engaging with the lower end of the guide shank while its upper end isprovided with a clamping screw nut 96 engaging with the upper end of theguide shank for holding these parts in position relatively to each otherafter adjustment. On its underside the supporting head 95 is provided atits opposite edges with two horizontal parallel guide grooves 22 whichhave their concave sides facing each other and which receive parallelhorizontal flanges or guide flanges 97 formed on the upper part of thesupporting block adjacent to opposite edges thereof. By means of theseguide flanges and grooves the supporting block may be readily attachedto or removed from the supporting head and interchanged for one oflarger or smaller dimensions to suit the size of the printing platewhich is being used and by raising or lowering the shank together withthe parts mounted thereon the cushioned underside of the supportingblock may be either pressed against the back or unsensitized surface ofthe print receiving plate for reliably supporting the latter during theprinting operation, or withdrawing therefrom so as to free the printreceiving plate and permit the same to be shifted horizontally into thedesired position.

In order to permit of readily and accurately adjusting the printingplate, the supporting block and associated parts, so that they occupythe same position relatively to the sensitized. surface, indicatingmeans are provided which may be variously constructed but whichpreferably comprise a pointer or mark 98 formed on the edge of thesupporting table 72 and adapted to traverse a scale or row ofgraduations 99 on the adjacent edge of the shelf 73 and a mark orpointer 100 is arranged on the edge of the supporting head 95 andadapted to traverse a scale or row of graduations 101 arranged on aflange 102 formed on the lower end of the guide shank 84, as shown inFigs. 1 and 3.

Means are provided for withdrawing the hot air forcibly from theinterior of the light chamber and admitting fresh, cool air into theinterior of the same, so as to prevent the light chamber and associatedparts from becoming unduly heated by the lamp within the light chamber.Various means may be employed for this purpose, those, for example,which are shown in the drawings comprising a plurality of perforatedoutlet pipes 103 mounted within the upper part of the light chamber, anexhaust fan or blower 104C arranged on a suitable support outside of thelight chamber and having its eye connected with the perforated outletpipes by a conduit which contains a flexible section 105 so as to permitthe light chamber to be adjusted horizontally about. its vertical axis.

The external cool air may be admitted to the light chamber in variousways, for instance, through an opening or passage 106 leading from thebottom of the light chamber downwardly through the lower vertical pivot75 to the exterior of the machine, where suitable provision may be madeso that the light from the lamp in the light chamber ".vill not act uponthe sensitized surface of thg print receiving member which is exposedoutside of the light chamber.

In the operation of this machine the printing frame carrying thetransparent supporting and printing plates is introduced into the upperend of the light chamber while the cams 65 are lowered and thesupporting block is elevated to its highest position thereby allowingthe operators ample room for properly manipulating the printing frameand associated parts. In the lowered position of the printing plate thesame rests on ledges 59 on the upper end of the lamp box.

The printing rack carrying the sensitized print receiving plate is nowplaced within the secondary carriage and secured thereto in the properposition between the printing plate and the back supporting plate. Theprimary and secondary carriages are now shifted horizontally relativelyto each other and to the main frame for bringing the de sired part ofthe sensitized surface of the print-receiving plate in line with theprint ing plate and the supporting block after which the cams 65 areturned so as to raise the printing plate into contact with thesensitized surface and the back supporting block or platen is lowered soas to press firmly against the back of the print receiving plateopposite the printing plate. The light is now turned on within the lampchamber or light box whereby a photo graphic impression of the printingplate is produced on the sensitized surface. After the printing platehas been exposed to this light a sufiicient length of time while inengagement with the sensitized surface the light is turned off, the backsupporting plate is raised and the printing frame is lowered, therebyleaving the sensitized plate free to be shifted horizontally in anydirection for presenting any other desired part of the sensitizedsurface to the printing position, this universal horizontal movement ofthe sensitized member being possible by reason of the primary carriagebeing movable lengthwise and the secondary carriage being movabletransversely relatively to each other and to the stationary parts of theframe.

It will be noted that this machine is comparatively simple inconstruction and easy of manipulation that the weight of the movableparts is so taken up that no parts are strained and possibly interferewith the accuracy of the printing operation, that the same is compact inconstruction and requires a minimum. of effort on the part of theoperatives to n'ianipulate the different working parts and that thesensitized surface of the print receiving member is not liable to bemarred or injured by the lodging of dust or dirt particles on the same,thereby permitting the production of accurate and perfect printing plaat a minimum of cost.

We claim as our invention:

1. A, photographic printing machine comprising a main rame, a primarycarriage movable horizontally in one direction on said frame, asecondary carriage movable horizontally on said primary carriage,meansfor supporting a sensitized member on said secondary carriage,comprising a rack having a frame detachably mounted on thesecondarycarriage, and stretching bars adjustably mounted on said frame andadapted to be connected with said sensitized member, and means forproducing photographic impressions on said sensitized member.

2. A photographic printing machine comprising a main frame, a primarycarriage movable horizontally in one direction on said frame, asecondary carriage movable horizontally on said primary carriage, meansfor supporting a sensitized member on said secondary carriage,comprising a rack having a frame detachably mounted on the secondarycarriage and provided with parallel rows of openings in two of its bars,parallel stretching bars each provided at its ends with perforated lugsengaging said perforated bars, pins passing through the openings in saidlugs and perforated bars, and clamps mounted on said stretching bars andadapted to grip said sensitized members.

3. A photographic printing machine comprising means for supporting amember having a sensitized surface, a transparent printing plateaca-pted to engage said sensi tized surface, a frame on which'said plateis mounted, means for moving said frame toward said member comprising aplurality of cams engaging said frame, and means for operating said camssimultaneously comprising rock shafts on which said cams are mounted,rock arms secured to said shafts, a relatively fixed guide arrangedbetween said shafts and a clamping device slidable on said guide andadjustably connected with both of said arms. 1

4-; A photographic printingmachine com prising a m in frame, a primarycarriage movable horizontally in one direction on said frame, asecondary carriage movable horizontally on said primary carriage, meansfor supporting a sensitized member on said secondary carriage,a'transparent printing plate adapted to engage the sensitized surface ofsaid member and a supporting block port a printing plate, a lightchamber adapted to engage the unsensitized surface of said member, meansfor moving said plate and block toward and from opposite sides of saidmember, and means for rotat ing said plate and block in planes parallel.with the surfaces of said sensitized member.

5. A photographic printing machine comprising means for supporting amember having a sensitized surface, printing plate, a printing framesupporting said printing plate, and a light chamber having its upper endopen and adapted to receive said printing frame and having the upperpart of one of its walls provided with a passageway through which theprinting frame and associated parts may be moved horizontally into andout of said light chamber.

G. A photographic printing machine comprising means for supporting amember having a sensitized surface, a printing plate, a printing framesupporting said printing plate, and a light chamber having its upper endopen and adapted to receive said printing frame and having some of itswalls extending upwardly along side of some edges of the printing framewhile one of its walls terminates below the printing frame and the upperof the other walls forming a passageway through which the printing frameand associated parts may be'moved horizontally into and out of saidlight chamber,

7. A photographic printing machine comprising means for supporting asensitized member, a printing frame adapted to support a printing plate,a light chamber in which the printing frame is mounted, and means forrotatably supporting said light chamber in a plane parallel with saidsensitized member and printing plate.

8. A photographic printing machine com prising means for supporting asensitized member, a printing frame adapted to supin which the printingframe is mounted, and means for rotatably supporting said light chamberin a plane parallel with said sensitized member and printing plate,comprising a table upon which said chamber is mounted and which isprovided with a pivot, abase provided with a bearing in which said pivotis journaled and means for holding said pivot and associated partsagainst turning.

5/. A photographic printing machine comprising means for supporting asensitized member, a printing frame adapted to support a printing plate,a light chamber in which the printing frame is mounted, and means forrota-tably supporting said light chamber in a plane parallel with saidsensitized memher, and printing plate, comprising a table upon whichsaid chamber is mounted and which is provided with a pivot, a base pro-\vided with a-bearing in which said pivot is j ournaled and provided witha split lengthwise of said pivot, screw nuts mounted on said base onopposite sides of its split and a clamping screw engaging both of saidscrew nuts.

10. A photographic printing machine comprising means for supporting amember having a sensitized surface, a printing plate adapted to engagethe sensitized surface of said member, a supporting block adapted toengage the opposite side of said member, and means for moving said blocktoward and from said sensitized member comprising a shank on which saidblock is mounted, a guideway in which said shank slides, a gear rackarranged on said shank, and a pinion mounted on said guideway andmeshing with said gear rack.

11. A photographic printing machine comprising means for supporting amember ha"- ing a sensitized surface, a printing plate adapted to engagethe sensitized surface of said member, a supporting block adapted toengage the opposite side of said member, and means for moving said blocktoward and from said sensitized member comprising a shank on which saidblock is mounted, a guideway in which said shank slides, a gear rackarranged on said shank, a pinion mounted on said guidcway and meshingwith said gear rack, a worm wheel connected with said. gear wheel, and ashaft provided with a worm meshing with said worm wheel.

12. A photographic printing machine comprising means for supporting amember having a sensitized surface, a printing plate adapted to engagethe sensitized surface of said member, a supporting block adapted toengage the opposite side of said member, and a supporting head providedwith a guideway parallel with the plane of said sensitized member inwhich said supporting block slides for connecting and disconnecting saidsupporting block and head.

13. A photographic printing machine comprising means for supporting amember having a sensitized surface, a printing plate adapted to engagethe sensitized surface of said member, a supporting block adapted toengage the opposite side of said member, a supporting head on which saidsupporting block is mounted and which is provided with a pivot havingits axis arranged at right angles to the plane of said sensitizedsurface, and a bearing in which said pivot is journaled.

14. A photographic printing machine comprising means forsupporting amember having a sensitized surface, a printing plate adapted to engagethe sensitized surface of said member, a supporting block adapted toengage the opposite side of said member, a supporting head on which saidsupporting block is mounted, a pivot connected at one end with saidhead, a bearing in which said pivot is journaled and which is engaged atone end by said head, and a clamping screw nut arranged at the oppositeend of said pivot and engaging with the other end of said bearing. r-

15. A photographic printing machine comprising means for supporting amember having a sensitized surface, a printing plate adapted to engagethe sensitized surface of said member, a supporting block adapted toengage the opposite side of said member, a supporting head on which saidsupporting block is mounted and which is provided with a pivot havingits aXis arranged at right angles to the plane of said sensitizedsurface, a shank having a bearing in which said pivot turns, and aguideway in which said shank is slidable lengthwise.

16. A photographic printing machine comprising means for supporting amember 35 having a sensitized surface on one of its sides, a transparentprinting plate adapted to engage said sensitized surface, a transparentsupporting plate on which said printing plate is mounted, a printingframe on which the supporting plate is mounted, retaining blocksarranged on the printing frame and engaging with the edges of thesupporting plate, jaws guided on said blocks and engaging the edges ofsaid printing 5 plate, and clamping screws connecting said blocks andsaid jaws.

17. A photographic printing machine comprising a carriage, a stop onsaid carriage, a relatively stationary bracket, and a micrometer screwmounted on said bracket and adapted to be engaged by said step.

18. A photographic printing machine comprising a carriage, a stop onsaid carriage, a relatively stationary bracket, a micrometer screwmounted on said bracket and adapted to be engaged by said stop, arelatively stationary bar provided with a row of openings, and a pinpassing through said bracket, and One or another of the openings in saidbar.

19. A photographic printing machine comprising means for supporting asensitized member in a horizontal position with its sensitized surfacefacing downwardly, a printing plate adapted to engage the underside ofsaid member, a supporting block adapted to engage the upper side of saidmember, a light chamber on which said printing plate is mounted, abaseon which the light chamber is mounted, an arm which projectsupwardly from said base and overhangs said sensitized member and onwhich said supporting block is mounted, a primary carriage movablehorizontally in one direction, guides on which said primary carriage ismounted, and a secondary carriage on which said sensitized member ismounted and which is movable horizontally on said primary carriage atright angles thereto.

20. A photographic printing machine comprising a light chamber, meansfor supporting a printing plate in said chamber, illuminating meansarranged Within said chamber, and means for forcibly Withdrawing the airfrom said chamber.

21. A photographic printing machine comprising a light chamber, meansfor sup porting a printing plate in said chamber, illuminating meansarranged Within said chamber, and means for forcibly withdrawing the airfrom said chamber comprising a blower having its inlet communicatingWith the interior of said chamber.

22. A photographic printing machine comprising means for supporting asensitized member, a printing plate adapted to engage the sensitizedsurface of sald member, a llght chamber on which said prlntmg plate ismounted and Which is rotatable H about an axis at right angles to theplane of said sensitized surface, a supporting block adapted to engagethe opposite side of said member, means on Which said block is mountedand which are rotatable about an axis at right angles to the plane ofsaid sensitized member, and means for indicating the relative positionof said printing plate, supporting block and sensitized member aboutsaid axes.

lVitness our hands this 12th day of June, 0

JOHN H. FULLMER. ROBERT W. RUNSER.

Witnesses:

THEO. L. Porr, E. GRAHAM.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, walhington, D. 0.

